CN111810947B - High-temperature industrial porous medium combustion system - Google Patents
High-temperature industrial porous medium combustion system Download PDFInfo
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- CN111810947B CN111810947B CN202010618452.1A CN202010618452A CN111810947B CN 111810947 B CN111810947 B CN 111810947B CN 202010618452 A CN202010618452 A CN 202010618452A CN 111810947 B CN111810947 B CN 111810947B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/12—Radiant burners
- F23D14/14—Radiant burners using screens or perforated plates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/48—Nozzles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/48—Nozzles
- F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
- F23D14/82—Preventing flashback or blowback
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q3/00—Igniters using electrically-produced sparks
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The invention relates to a porous medium combustion system for high-temperature industry, which comprises an air-fuel mixing system, a porous medium combustion device, an ignition burner and an ignition control system. The air-fuel gas mixing system is provided with an air pipeline, a fuel gas pipeline, an electromagnetic cut-off valve, two automatic regulating valves, a mixer and an explosion-proof valve, wherein the two automatic regulating valves realize automatic regulation of air and fuel gas flow through a proportional relation; the porous medium combustion device is provided with an air equalizing chamber, an air distribution plate, a combustion panel and a burner liner; the ignition burner is provided with a nozzle and a spray pipe; the ignition control system is provided with an electrode, an ignition power supply and a control device, the electrode is arranged on the ignition burner, the ignition power supply is respectively connected with the electrode and the control device, and the control device is provided with an ignition module, a flame detection module and a fault alarm/interlocking module. The combustion system can prolong the service life of the electrode, improve the ignition stability, enhance the flame monitoring effect and improve the controllability, integrity and safety of the system.
Description
Technical Field
The invention relates to a high-temperature industrial porous medium combustion system, wherein the high temperature is higher than or equal to 850 ℃, in particular to a porous medium combustion system for industrial application with the temperature of higher than or equal to 850 ℃.
Background
The porous medium combustion technology has the advantages of high combustion efficiency, low nitrogen oxide emission, high heating efficiency and the like, and is very suitable for industrial application under the requirements of energy conservation and environmental protection. Many researchers have developed a wide variety of porous medium combustion devices, and little research has been conducted on porous medium combustion systems. At present, the reported porous medium combustion system on one hand rarely involves the automatic regulation and combustion safety control of air and fuel gas, and the lack of the technologies is undoubtedly incomplete for the industrial application of the porous medium; on the other hand, the ignition mode is mainly the mode that an ignition electrode is arranged above a porous medium combustion panel or embedded in the porous medium, the ignition electrode ignites the gas at the porous medium by means of high-voltage discharge, the ignition electrode is also a detection electrode, the detection electrode is connected with a control system of the porous medium combustion device, when the detection electrode detects the flame at the porous medium, the combustion is considered to be normal, and the air and fuel are continuously supplied; when the flame signal cannot be detected by the detection electrode, the combustion is considered to be in fault, the control system issues a combustion closing instruction, and the porous medium combustion device stops working. This form of ignition system suffers from the following problems: (1) the electrode is positioned at the high-temperature radiation panel, the requirement on the high-temperature resistance of the electrode material is high, the electrode can be shortened in service life when working in a high-temperature environment for a long time, and in addition, the electrode is difficult to disassemble and replace after being damaged; (2) when the load of the porous medium combustion device changes or the pressure of the gas supply pipe network fluctuates, the flame surface in the porous medium moves along the axis direction, and the position of the electrode is fixed, so that the problems of false alarm, combustion closing and the like caused by the fact that the flame cannot be detected by the detection electrode can be caused; (3) the electrode, especially the electrode buried in the porous medium, can influence gas flow and electrode discharge stability, cause the burning inhomogeneous, produce unstable burning problems such as flame face slope, flame face fracture, bring the potential safety hazard.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a high-temperature industrial porous medium combustion system which can improve the safety and the integrity of the porous medium combustion system, enhance the ignition stability of a porous medium combustion device, prolong the service life of an electrode and improve the effectiveness of flame monitoring.
In order to achieve the purpose, the invention adopts the technical scheme that: the porous medium combustion system for the high-temperature industry comprises an air-fuel mixing system, a porous medium combustion device, an ignition burner and an ignition control system;
the air-fuel gas mixing system is provided with a gas pipeline, an air pipeline, an electromagnetic cut-off valve, two automatic regulating valves, a mixer and an explosion-proof valve; the gas pipeline is provided with an electromagnetic cut-off valve which is used for automatically opening or closing gas when receiving the command of the ignition module; the two automatic regulating valves are respectively arranged on the air pipeline and the gas pipeline, and the automatic regulation of the air-fuel flow is realized through the proportional relation between the two automatic regulating valves; the air pipeline and the gas pipeline are respectively connected with the mixer, and the air and the gas are uniformly mixed in the mixer; the mixed gas pipeline behind the mixer is divided into three branch pipes, wherein one branch pipe is provided with an explosion-proof valve for releasing pressure to ensure the safety of the whole system when the mixed gas pipeline works abnormally; the other two branch pipes are respectively connected with the main burner hand valve and the ignition burner hand valve for realizing manual intervention when the automatic control system fails; the manual valve of the main burner is connected with the porous medium combustion device, and the manual valve of the ignition burner is connected with the ignition burner;
the porous medium combustion device is provided with an air equalizing chamber, an air distribution plate, a combustion panel and a burner liner; the gas equalizing chamber is a divergent channel, which is beneficial to guiding the mixed gas; the air distribution plate is provided with a small-diameter straight-through hole to realize uniform air distribution and prevent tempering, and is made of a refractory material panel to resist high-temperature erosion; the combustion panel is a large-pore density foam ceramic plate; the burner lining is a light refractory material lining to protect the gas homogenizing chamber and isolate the heat transfer of the hearth to the gas in the gas homogenizing chamber;
the ignition burner is a low-power open flame burner and consists of a nozzle and a spray pipe, and an electrode mounting hole and a peephole are formed in the burner;
the ignition control system is provided with an electrode, an ignition power supply and a control device; the electrode is detachably arranged on the ignition burner; the ignition power supply is respectively connected with the control device and the electrode through leads; the control device is provided with an ignition module, a flame detection module and a fault alarm/linkage module, the ignition module is used for issuing an ignition command, the flame detection module is used for detecting the current value generated by flame ionization, judging whether flame exists or not, the fault alarm/linkage module is used for alarming after ignition failure or flame failure detection, and simultaneously, a valve closing instruction is sent out to an electromagnetic cut-off valve on a gas pipeline.
The gas equalizing chamber in the porous medium combustion device is a divergent channel, and the ratio of the area of the outlet of the channel to the area of the inlet of the channel is 1.25: 1-3: 1.
And the nozzle and the spray pipe in the ignition burner are cast by heat-resistant steel.
The ignition burner is arranged on the side part of the porous medium combustion device, and the outlet of the ignition burner leans against the side of the porous medium panel.
The air distribution plate in the porous medium combustion device of the porous medium combustion system for the high-temperature industry is provided with a small-diameter straight-through hole with the diameter of 0.8-1.2 mm so as to realize uniform air distribution and prevent tempering, the air distribution plate is made of cordierite and has the thickness of 10-12 mm; the combustion panel is a high-temperature-resistant foam ceramic plate, and the pore density is more than 35 PPI; the diameter of a spray pipe in the ignition burner is 18-25 mm; the air-fuel ratio set in the air-fuel mixing system is 1.03-1.05.
Compared with the prior art, the high-temperature industrial porous medium combustion system has the advantages that:
the porous medium combustion system for the high-temperature industry is scientific in structure, and solves the problems that air and fuel cannot be automatically adjusted and combustion safety is prevented and controlled in the prior art. The combustion system is provided with an air-fuel gas mixing system for mixing air and fuel gas in proportion, and has an explosion-proof function; the designed porous medium combustion device is used for organizing the combustion of mixed gas and has the functions of uniform combustion and tempering avoidance; the designed ignition burner is used for igniting the porous medium combustion device; the designed ignition control system is used for issuing an ignition instruction, igniting an ignition burner, organizing flame detection, giving a fault alarm, issuing a combustion cutting-off instruction and the like. The controllability, the integrity and the safety of the combustion system are comprehensively improved through the scientific structural design of the combustion system.
The combustion system carries out innovative design on the ignition system, safe and effective ignition and detection are carried out through the ignition control system independent of the porous medium combustion device, the design that the electrode is originally arranged at the porous medium combustion panel is abandoned, the electrode is arranged at the ignition burner, the control device of the ignition control system ignites the air-fuel mixture passing through the ignition burner, and then the ignition burner ignites the porous medium combustion device. Therefore, the ignition burner is in a normally-open state during the working period of the combustion system, the flame is in a free space flame form, and the electrode is always positioned in the flame no matter how the combustion load and the pressure of a pipe network fluctuate, so that the flame detection effectiveness is ensured.
Thirdly, the ignition burner nozzle in the combustion system is arranged on the side part of the porous medium combustion device, and the outlet of the ignition burner nozzle is leaned beside the porous medium panel, so that the combustion of the mixed gas passing through the porous medium panel can be ensured; the electrode is installed on the ignition burner, and is convenient to detach and replace.
The electrode in the combustion system is always in the free flame of the low-power ignition burner, so that the service life of the electrode is effectively prolonged. On the other hand, the controllability, the integrity and the safety of the combustion system are improved by arranging the air-fuel gas proportional control and the explosion-proof valve.
Drawings
FIG. 1 is a schematic structural composition diagram of a high-temperature industrial porous medium combustion system according to the present invention.
In the figure: 1-porous medium combustion device; 2-ignition burner; 3-an electrode; 4-ignition power supply; 5-a control device; 6-automatic gas regulating valve; 7-electromagnetic cut-off valve; 8-automatic air regulating valve; 9-a mixer; 10-explosion-proof valve; 11-a main burner manual valve; 12-ignition burner manual valve; 13-gas pipeline; 14-gas node; 15-air line; 16 — air node; 17-furnace wall. The dotted lines in the figure are signal control lines.
Detailed Description
The high temperature industrial porous medium combustion system of the present invention will be described in further detail with reference to the accompanying drawings and examples, but the practice of the present invention is not limited thereto.
Example 1: the invention provides a high-temperature industrial porous medium combustion system, the structure of which is shown in figure 1, wherein the combustion system comprises an air-fuel mixing system, a porous medium combustion device 1, an ignition burner 2 and an ignition control system;
the air-fuel gas mixing system is provided with a gas node 14, a gas pipeline 13, an air node 16, an air pipeline 15, an electromagnetic cut-off valve 7, two automatic regulating valves, a mixer 9 and an explosion-proof valve 10; the gas pipeline is provided with an electromagnetic cut-off valve which is used for automatically opening or closing gas when receiving the command of the ignition module; the two automatic regulating valves are a gas automatic regulating valve 6 and an air automatic regulating valve 8 which are respectively arranged on a gas pipeline and an air pipeline, and the automatic regulation of the air flow and the fuel gas flow is realized through the proportional relation between the two automatic regulating valves; the air pipeline and the gas pipeline are respectively connected with the mixer 9, and the air and the gas are uniformly mixed in the mixer; the mixed gas pipeline behind the mixer is divided into three branch pipes, wherein one branch pipe is provided with an explosion-proof valve 10 for releasing pressure to ensure the safety of the whole system when the mixed gas pipeline works abnormally; the other two branch pipes are respectively connected with a main burner manual valve 11 and an ignition burner manual valve 12, the main burner manual valve is connected with the porous medium combustion device 1, and the ignition burner manual valve is connected with the ignition burner 2. The main burner manual valve and the ignition burner manual valve are used for realizing manual intervention when the automatic control system fails, and ensuring safe operation of the combustion system.
The porous medium combustion device 1 is arranged in the furnace wall 17 and is provided with an air equalizing chamber, an air distribution plate, a combustion panel and a burner liner; the gas equalizing chamber is a divergent channel which is beneficial to guiding the mixed gas, and the ratio of the area of the outlet of the channel to the area of the inlet of the channel is 1.25: 1; the air distribution plate is provided with a small-diameter straight-through hole, the diameter of the hole is 0.8mm, the material of the air distribution plate is cordierite, and the thickness of the air distribution plate is 10 mm; the combustion panel is a SiC foam ceramic plate, and the pore density is 35 PPI; the burner lining is a light refractory material lining to protect the gas equalizing chamber and isolate the heat transfer of the hearth to the gas in the gas equalizing chamber.
The ignition burner 2 is a low-power open flame burner and consists of a nozzle and a spray pipe, wherein the nozzle and the spray pipe are cast by heat-resistant steel, the heat-resistant steel is made of 0Cr25Ni20, and the diameter of the spray pipe is 18 mm. The ignition burner is arranged at the side part of the porous medium combustion device, and the outlet open fire end of the ignition burner leans against the porous medium panel at the inner side of the furnace wall 17. Be equipped with the mounting hole and the peephole of electrode on the ignition nozzle, be provided with the flange hole at ignition nozzle top promptly, can be connected with the electrode flange to realize the dismouting of electrode 3.
The ignition control system is provided with an electrode 3, an ignition power supply 4 and a control device 5; the electrode 3 is made of Cr30Ni50W13 high nickel chromium material and is detachably arranged on the ignition burner 2; the ignition power supply 4 is respectively connected with the control device 5 and the electrode 3 through leads; controlling means 5 be equipped with ignition module, flame detection module and malfunction alerting interlocking module, ignition module is used for assigning the ignition order, flame detection module is used for detecting the current value that flame ionization produced, judges whether flame exists, malfunction alerting interlocking module is used for the ignition failure or can not detect the warning behind the flame, sends the valve to the electromagnetism trip valve on the gas pipeline simultaneously and closes the instruction.
The dotted lines in the figure are signal control lines. When the control device 5 issues an ignition command, the ignition power supply pressurizes the electrode and performs ignition in the form of high-voltage discharge. The gas pipeline 13 is provided with a gas automatic regulating valve 6 and an electromagnetic cut-off valve 7; an automatic air regulating valve 8 is arranged on the air pipeline 15; the two automatic regulating valves are related through an air-fuel ratio which is set to be 1.05, and when the combustion load changes, the gas flow regulation in the gas automatic regulating valve automatically drives the air automatic regulating valve to regulate the air flow, so that the air flow ratio and the gas flow ratio are kept unchanged. The proportional regulation relation of the automatic air-fuel regulating valve is set by the control device 5; the gas electromagnetic cut-off valve 7 can be opened or closed according to the instruction of the control device.
Example 2: the invention provides a high-temperature industrial porous medium combustion system, which has a structure basically the same as that of the embodiment 1, and comprises an air-fuel mixing system, a porous medium combustion device 1, an ignition burner 2 and an ignition control system; except that; in the divergent channel of the gas equalizing chamber, the ratio of the area of the channel outlet to the area of the channel inlet is 2: 1; a pore density of 25 PPI; the air distribution plate is provided with a small-diameter straight-through hole, the diameter of the hole is 0.9mm, the thickness of the air distribution plate is 10.5mm, and the diameter of the spray pipe is 20 mm; the air-fuel ratio was set to 1.04.
Example 3: the invention provides a high-temperature industrial porous medium combustion system, which has a structure basically the same as that of the embodiment 1, and comprises an air-fuel mixing system, a porous medium combustion device 1, an ignition burner 2 and an ignition control system; except that; in the divergent channel of the gas equalizing chamber, the ratio of the area of the channel outlet to the area of the channel inlet is 2: 1; a pore density of 10 PPI; the air distribution plate is provided with a small-diameter straight-through hole, the diameter of the hole is 1.0mm, the thickness of the air distribution plate is 11mm, and the diameter of the spray pipe is 20 mm; the air-fuel ratio was set to 1.03.
Example 4: the invention provides a high-temperature industrial porous medium combustion system, which has the structure basically the same as that of the embodiment 1 except that the structure is different; in the divergent channel of the gas equalizing chamber, the ratio of the area of the channel outlet to the area of the channel inlet is 3: 1; the air distribution plate is provided with a small-diameter straight-through hole, the diameter of the hole is 1.1mm, the thickness of the air distribution plate is 11.5mm, and the diameter of the spray pipe is 25 mm.
Example 5: the invention provides a high-temperature industrial porous medium combustion system, which has a structure basically the same as that of the embodiment 1, and comprises an air-fuel mixing system, a porous medium combustion device 1, an ignition burner 2 and an ignition control system; except that; in the divergent channel of the gas equalizing chamber, the ratio of the area of the channel outlet to the area of the channel inlet is 2: 1; the air distribution plate is provided with a small-diameter straight-through hole with the diameter of 1.0mm, the thickness of the air distribution plate is 11mm, and the combustion panel is Al2O3The diameter of a nozzle of the foamed ceramic plate is 20 mm.
Example 6: the invention provides a high-temperature industrial porous medium combustion system, which has the structure basically the same as that of the embodiment 1 except that the structure is different; in the divergent channel of the gas equalizing chamber, the ratio of the area of the channel outlet to the area of the channel inlet is 2.5: 1; the air distribution plate is provided with a small-diameter through hole with the diameter of 1.2mm, the thickness of the air distribution plate is 12mm, and the combustion panel is ZrO2The diameter of a nozzle of the foamed ceramic plate is 22 mm.
The combustion system solves the problems of low ignition stability and safety, short service life of the ignition device and difficult flame monitoring of the porous medium combustion system in the prior art, and achieves the technical effects of improving the ignition stability and safety, prolonging the service life of the ignition device and effectively monitoring the flame.
Claims (3)
1. A porous medium combustion system for high-temperature industry comprises an air-fuel mixing system, a porous medium combustion device, an ignition burner and an ignition control system; the method is characterized in that:
the air-fuel gas mixing system is provided with a gas pipeline, an air pipeline, an electromagnetic cut-off valve, two automatic regulating valves, a mixer and an explosion-proof valve; the gas pipeline is provided with an electromagnetic cut-off valve which is used for automatically opening or closing gas when receiving the command of the ignition module; the two automatic regulating valves are respectively arranged on the air pipeline and the gas pipeline, and the automatic regulation of the air-fuel flow is realized through the proportional relation between the two automatic regulating valves; the air pipeline and the gas pipeline are respectively connected with the mixer, and the air and the gas are uniformly mixed in the mixer; the mixed gas pipeline behind the mixer is divided into three branch pipes, wherein one branch pipe is provided with an explosion-proof valve for releasing pressure to ensure the safety of the whole system when the mixed gas pipeline works abnormally; the other two branch pipes are respectively connected with the main burner hand valve and the ignition burner hand valve for realizing manual intervention when the automatic control system fails; the manual valve of the main burner is connected with the porous medium combustion device, and the manual valve of the ignition burner is connected with the ignition burner;
the porous medium combustion device is provided with an air equalizing chamber, an air distribution plate, a combustion panel and a burner liner; the gas equalizing chamber is a divergent channel, which is beneficial to guiding the mixed gas; the air distribution plate is provided with a small-diameter straight-through hole to realize uniform air distribution and prevent tempering, and is made of a refractory material panel to resist high-temperature erosion; the combustion panel is a large-pore density foam ceramic plate; the burner lining is a light refractory material lining to protect the gas homogenizing chamber and isolate the heat transfer of the hearth to the gas in the gas homogenizing chamber;
the ignition burner is a low-power open flame burner and consists of a nozzle and a spray pipe, the ignition burner is arranged at the side part of the porous medium combustion device, and the outlet of the ignition burner leans against the side of the porous medium panel; an electrode mounting hole and a peephole are formed in the ignition burner;
the ignition control system is provided with an electrode, an ignition power supply and a control device; the electrode is detachably arranged on the ignition burner; the ignition power supply is respectively connected with the control device and the electrode through leads; the control device is provided with an ignition module, a flame detection module and a fault alarm/linkage module, the ignition module is used for issuing an ignition command, the flame detection module is used for detecting the current value generated by flame ionization, judging whether flame exists or not, the fault alarm/linkage module is used for alarming after ignition failure or flame failure detection, and simultaneously, a valve closing instruction is sent out to an electromagnetic cut-off valve on a gas pipeline.
2. A high temperature industrial porous media combustion system as in claim 1, wherein: the gas equalizing chamber in the porous medium combustion device is a divergent channel, and the ratio of the area of the outlet of the channel to the area of the inlet of the channel is 1.25: 1-3: 1.
3. A high temperature industrial porous media combustion system as in claim 1, wherein: and the nozzle and the spray pipe in the ignition burner are cast by heat-resistant steel.
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